This kind of goes back, when Germany used Yaba as a combat drug. It is now overtaking Thailand and spreading to the US as well. It has serious side-effects of driving the user into insanity with extreem paranoia. But they do give enhanced strength and a surge of energy. They also cause short-term memory loss and other things.
[link|http://www.bap.admin.ch/e/archiv/medien/2001/08141.htm|[link|http://www.bap.admin.ch/e/archiv/medien/2001/08141.htm|http://www.bap.admi...01/08141.htm]]
[link|http://www.toxi.ch/eng/news_966076389_15964.html|[link|http://www.toxi.ch/eng/news_966076389_15964.html|http://www.toxi.ch/...9_15964.html]]
[link|http://news.bbc.co.uk/1/hi/uk/1963574.stm|[link|http://news.bbc.co.uk/1/hi/uk/1963574.stm|http://news.bbc.co..../1963574.stm]]
In Thailand there are many reports on the news of Yaba users taking hostages (mostly children or women are taken as hostages) and getting into a stand-off with Police.
In Thai, "Ya" means Medicine, and "Ba" means Crazy. That is why it is caused Crazy Pills or Crazy Medicine. It drives people crazy that take it.